California's efforts to implement stricter emissions rules for diesel-powered trains and big rigs have hit a roadblock as the state withdrew its requests for federal approval. The California Air Resources Board made this decision due to the lack of approval from the U.S. Environmental Protection Agency (EPA). The move comes just before the end of President Joe Biden's term, with concerns about potential opposition from the incoming administration.
One of the rules that California pulled back on aimed to phase out the sale of new diesel-powered semi-trucks and buses by 2036. Another regulation would have banned locomotive engines over 23 years old by 2030, promoting the use of zero-emissions technology in freight transportation. Both rules faced industry opposition, citing high costs and implementation challenges.
